Bus Bar Heat Dissipation for High-Temp Wire Termination
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Solution Overview
Problem
Electrical distribution systems face challenges in connecting high-temperature electrical wires to circuit interrupters with lower temperature limits, leading to potential erratic operation and costly replacements when high-temperature wires are mistakenly installed for components rated for lower temperatures.
Innovation Solution
A bus bar apparatus with enhanced heat dissipation capabilities, including conductive bus bars and optional fins or heat sinks, is designed to maintain the temperature of the connection with the circuit interrupter at or below 75°C when connected to 90°C wires, allowing safe and efficient operation while enabling the use of higher ampacity wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 90°C wire is connected directly to a circuit interrupter rated for 75°C, then the wire can operate at higher ampacity, but the circuit interrupter temperature will exceed its maximum limit causing erratic operation
Solution Approach 1:
A bus bar apparatus is introduced as an intermediary component between the 90°C wire and the 75°C circuit interrupter. The bus bar includes a first portion that contacts the wire and a second portion that contacts the circuit interrupter, with a thermally conductive path between them. This intermediary structure allows the high-temperature wire to operate at full ampacity while the bus bar dissipates heat to keep the circuit interrupter within its temperature rating.
2Loss of time
If 90°C wire is installed without verifying component temperature ratings, then installation is completed quickly, but costly replacement is needed if the wire cannot be connected to the circuit interrupter
Solution Approach 1:
The bus bar apparatus is pre-configured with temperature dissipation features (such as heat sinks or specific geometric designs) that ensure compatibility with both 90°C wires and 75°C circuit interrupters. By implementing the temperature management solution in advance during bus bar manufacturing, the system eliminates the need for post-installation verification and potential costly replacements, allowing contractors to confidently use 90°C wire for maximum ampacity.
3Device complexity
If conventional direct connection is used between wire and circuit interrupter, then the connection is simple, but heat dissipation is insufficient causing temperature exceedance
Solution Approach 1:
The bus bar apparatus transitions from a simple linear connection to a three-dimensional structure that incorporates heat dissipation features. The bus bar includes protrusions, fins, or heat sink geometries that extend into the surrounding air, utilizing the third dimension to increase surface area for convective and radiative heat transfer. This dimensional enhancement allows effective temperature management while maintaining a relatively simple overall connection structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The bus bar apparatus effectively dissipates heat to ensure the circuit interrupter operates within safe temperature limits, preventing erratic behavior and allowing the use of higher ampacity wires without the need for costly replacements or reinstallation.
Implementation Method 1
The bus bar apparatus may include bus bars that extend directly between the high temperature wires and the low temperature electrical component
Implementation Method 2
The bus bars may additionally include fins or supplementary heat sinks to enhance thermal convection of the bus bar
Data Source
AI summary
An improved bus bar apparatus is usable in high temperature electrical terminations and is configured to provide sufficient heat dissipation such that when connected at one end with a 90° C. wire, the bus bar apparatus is at most only at 75° C. at another end thereof, which end can be connected with a lower temperature electrical component such as a circuit interrupter. The bus bars apparatus may include bus bars that extend directly between the high temperature wires and the low temperature electrical component, or the bus bar apparatus may additionally include wires that are electrically interposed between the low temperature region of the bus bars and the electrical component. Additional cooling could be provided by employing oversized wires. The bus bars may additionally include fins, fans, or supplementary heat sinks to enhance thermal convection of the bus bar. The bus bar apparatus additionally can be provided with its own enclosure to be usable in a retrofit situation.